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Get task description and approver name from SharePoint designer 2013 workflow..

Question

We have crated a workflow using SharePoint designer 2013. We are using Start a task process to send approval task. Once approver approves it we want to set Business Approver fields value to Last approver name. We also want to get task description value and
set it to list fields.

Thank you for your answer. We have to assign this task to a SharePoint group. And in this SharePoint group we have 9 users. This is the reason we are using "Start a Task Process" instead of "Assign a Task" workflow action.
Do you know how can I get approver and comments if I am using "Start a Task Process" workflow action.